v3.26.1
Discontinued Operations - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2025
Apr. 10, 2025
Apr. 07, 2025
Mar. 13, 2025
Sep. 27, 2024
Apr. 26, 2019
Mar. 31, 2025
Feb. 28, 2025
Mar. 27, 2026
Mar. 28, 2025
Mar. 27, 2026
Mar. 28, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Miscellaneous expense                 $ (17,656) $ (103,260) $ (17,370) $ (233,367)
Loss on investment in equity securities                   109,500 0 254,677
Transition services agreement, expenses incurred                   (10,300) (100) (21,700)
Net Loss Attributable to Jacobs from Discontinued Operations                 (2,890) (5,550) (2,336) (6,551)
Worley Stock                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Business combination consideration equity issued           $ 58,200            
Worley                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Consideration transferred           3,400,000            
Consideration paid in cash           $ 2,800,000            
Net Loss Attributable to Jacobs from Discontinued Operations                   0   0
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Amentum Holdings, Inc.                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Discontinued operation, remaining shares held in escrow (in shares)     9,700,000                  
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SpinCo Business                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Stock issued during period, spinoff transaction ( in shares)         124,084,108              
Shares issued during period, spinoff, conversion ratio (in shares)         1              
Cash received from SpinCo business         $ 911,000              
Discontinued operation, working capital adjustment             $ 70,000          
Discontinued Operation, Working Capital Adjustment, Receivable             $ 24,000          
Discontinued operation, receivable balance collected   $ 70,000                    
Discontinued operations, accrued liability                 32,700   32,700  
Discontinued operation, remaining shares held in escrow (in shares) 7,300,000   7,300,000                  
Net Loss Attributable to Jacobs from Discontinued Operations                 $ (2,898) (5,560) $ (2,344) $ (6,562)
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SpinCo Business | Amentum Holdings, Inc.                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Equity method investment retained, shares owned after disposal (in shares)         29,200,000              
Equity method investment retained, shares transferred to escrow (in shares)         10,900,000              
Discontinued operation, remaining shares held in escrow (in shares)     2,400,000 9,700,000 18,300,000              
Investment in equity securities         $ 749,500              
Discontinued operation, entitled to receive shares held in escrow (in shares)               1,200,000        
Miscellaneous expense                   $ 21,900